Orbis ring-flashes have been a popular choice for people wanting to get into the game on a budget. Their adapter attaches to your strobe and converts it into a pretty nice ring-flash. Ring-flashes are a popular choice in fashion photography as well as macro work (among other things). Sadly, they've stopped production and the quantities available are considered close-outs. They're selling at about half the price so now would be a great time to grab one.
Check it out HERE